This is an older article and is really long, but an interesting read.

The Illegal-Alien Crime Wave
Heather Mac Donald


Some of the most violent criminals at large today are illegal aliens. Yet in cities where the crime these aliens commit is highest, the police cannot use the most obvious tool to apprehend them: their immigration status. In Los Angeles, for example, dozens of members of a ruthless Salvadoran prison gang have sneaked back into town after having been deported for such crimes as murder, assault with a deadly weapon, and drug trafficking. Police officers know who they are and know that their mere presence in the country is a felony. Yet should a cop arrest an illegal gangbanger for felonious reentry, it is he who will be treated as a criminal, for violating the LAPD’s rule against enforcing immigration law.

To read more, hit the link below.

http://www.city-journal.org/html/14_1_t ... alien.html